Weird rendering in blender
I downloaded the OBJ file and imported it, and sure enough;



I've seen this issue before. I don't know if it's the default in blender, but my "Clip Start" value was incredibly small (0.01m). I changed it to 1m, and the model looks fine now;



Edit: It's also worth noting that this model is massive. I scaled it WAY down to work with it originally. However, I started with a fresh file, imported it, and the following settings work with the original scaling;



The "Clip start" was making the surface look weird. The "Clip end" was cutting off the back of the model.